|Publication number||US7608121 B2|
|Application number||US 11/505,518|
|Publication date||Oct 27, 2009|
|Filing date||Aug 17, 2006|
|Priority date||Aug 17, 2006|
|Also published as||US20080041025|
|Publication number||11505518, 505518, US 7608121 B2, US 7608121B2, US-B2-7608121, US7608121 B2, US7608121B2|
|Inventors||Eugene C. Boyer, Gregory J Kowalski|
|Original Assignee||Delphi Technologies, Inc.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (25), Non-Patent Citations (1), Referenced by (9), Classifications (15), Legal Events (4)|
|External Links: USPTO, USPTO Assignment, Espacenet|
The present invention generally relates to a heating, ventilation and cooling (HVAC) system.
The HVAC system (or other cooling systems) typically employed in automotive vehicles (or other vehicles) include a plurality of heat exchangers for heat transfer with air passing threrethrough in different portions of the cycle or mode of operation. A compressor compresses refrigerant for expansion or evaporation. Such systems include condensers, radiators, evaporators, heaters, and the like. Normally, the system includes a housing surrounding one or more of the heat exchangers and defines an air inlet and an air outlet.
The ambient air entering the inlet frequently carries foreign matter, i.e., dirt and debris, in the air stream and such foreign matter lodges in the heat exchanger. Either no special filtration is provided so that the heat exchanger is not protected and or loses performance due to contamination or clogging. In some instances, a simple stationary screen is used (i.e., for condensers or radiators) but requires regular cleaning. Separate or multiple filter cartridges are sometimes used (i.e., for HVAC Heating and Cooling Modules or Systems) that require frequent cleaning and/or replacement due to contamination or plugging with dirt and/or debris.
In order to control air flow through radiators in an automotive vehicle, a sheet of blocking material has been supported on a plurality of rollers in the housing for selectively blocking the flow of air through the heat exchanger. The sheet presents an interior entrained about the rollers and extends in a path of movement over the air inlet and in front of the heat exchanger with an exterior for blocking air flow. Such an air regulating sheet is disclosed in U.S. Pat. No. 6,390,217 to O'Brien et al. and assigned to the assignee of the subject invention. An arrangement for cleaning a heat exchanger is illustrated in Japanese application 2002-362144.
The invention provides for the sheet disposed between the air inlet and the heat exchanger and having filtering air passages therethrough permitting air to flow through the sheet as the sheet filters foreign matter from the air flowing through the sheet.
The invention provides an air cleaning system that can catch and also release foreign matter such as dirt or debris that would otherwise contaminate or clog the various types of heat exchangers (HVAC Evaporator and Heater, Condenser, Radiator, etc.) used for cooling purposes. A moving filter sheet comprising a screen or fabric, or other filter material, would catch the dirt or debris in the inlet air stream that is ahead of the heat exchanger. The moving sheet would transport the captured dirt or debris to a cleaning station where it could either drop off (due to no air flow) or be blown off (by reverse direction and/or higher velocity air flow). The physical configuration of the sheet and the heat exchanger can vary based on the air supply scheme that is needed as well as available packaging space. The resulting location for the inlet air and outlet air can be as needed to achieve the best configuration to suit an application. Also the actual screen, fabric or other filtering medium design and material details can be as required to provide the needed filtration and air flow performance for the specific operating conditions and/or environment.
Other advantages of the present invention will be readily appreciated, as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings wherein:
Referring to the Figures, wherein like numerals indicate corresponding parts throughout the several views, a heating, ventilation and cooling system 20 is shown generally.
The system 20 includes a heat exchanger 22 for heat transfer with air passing there through. More specifically, the heat exchanger 22 could be a radiator or a condenser or a HVAC heat exchanger 22 module. A rectangular housing 24 surrounds the heat exchanger 22 and defines an air inlet 26 and an air outlet 28. As illustrated in
A plurality of rollers 32 are supported by the housing 24, at the corners of the housing 24 as illustrated in
The system 20 includes a drive mechanism 36 for moving the sheet 34 in the path. The drive mechanism 36 is illustrated in
Accordingly, the system 20 includes a cleaning station along the path for removing foreign matter from the sheet 34 and that cleaning station may include various combinations of components. Typically, the cleaning station is defined by a pair of the rollers 32 being spaced horizontally to establish a cleaning or horizontal reach 38 of the sheet 34 with the exterior facing downward for removing foreign matter under the force of gravity. As alluded to above, a chute 40 is disposed adjacent a first of the rollers 32 in the horizontal reach 38 for collecting foreign matter released from the sheet 34 as the sheet 34 moves around the first roller 32, i.e., the roller 32 in the bottom left hand corner. The chute 40 provides a clear exit path for debris to drop for collection in an appropriate container.
To positively remove the foreign matter from the filter sheet 34, the cleaning station includes a source of cleaning air for directing cleaning air into the interior of the sheet 34 and out of the exterior of the sheet 34 for removing foreign matter. In one instance the source of cleaning air includes a flow control 42, e.g., a baffle, for directing air exiting the heat exchanger 22 through the cleaning reach of the sheet 34. Alternatively or in addition, the source of cleaning air may include a nozzle 44 as illustrated in
Furthermore, the air outlet 28 could be a smaller cross sectional area than the cross sectional area of the air inlet 26 to increase the velocity of the cleaning air flow through the sheet 34 that results in an improved cleaning effect. The location and size/shape of the air inlet 26 and air outlet 28 and the chute 40 can vary as needed to provide the desired air flow and debris management path that is needed for each application.
In the embodiment of
Either embodiment may include a tensioning mechanism 48 or spring for applying a tension to the sheet 34, particularly a sheet 34 that is non-stretchable. On the other hand, a stretchable sheet 34 may be employed that has inherent memory for maintaining the sheet 34 in tension. One or more of the rollers 32 may be eccentric and/or present a variable shape between the ends thereof to enhance the release of the foreign matter. As illustrated in
As illustrated in
Thus, the moving air filter/screen system 20 provides for a continuously operating air filtration system 20 that is also self cleaning.
Obviously, many modifications and variations of the present invention are possible in light of the above teachings. The invention may be practiced otherwise than as specifically described within the scope of the appended claims.
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|1||English language Abstract for JP 2004-362144 extracted from espacenet.com database Jan. 31, 2006.|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US7794529 *||Dec 29, 2007||Sep 14, 2010||Hon Hai Precision Industry Co., Ltd.||Air filtering system|
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|US20140083295 *||Sep 27, 2012||Mar 27, 2014||Roll Filter Llc||Filter Assembly with Dynamic Filter Media|
|U.S. Classification||55/282.2, 55/302, 55/290, 55/428, 55/354, 55/467.1|
|Cooperative Classification||F24F2003/1639, F24F3/1603, B01D46/22, B01D2279/50, F24F1/0007|
|European Classification||F24F3/16B, F24F1/00C, B01D46/22|
|Aug 17, 2006||AS||Assignment|
Owner name: DELPHI TECHNOLOGIES, INC., MICHIGAN
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:BOYER, EUGENE C.;KOWLASKI, GREGORY J.;REEL/FRAME:018209/0624;SIGNING DATES FROM 20060801 TO 20060803
|Jun 7, 2013||REMI||Maintenance fee reminder mailed|
|Oct 27, 2013||LAPS||Lapse for failure to pay maintenance fees|
|Dec 17, 2013||FP||Expired due to failure to pay maintenance fee|
Effective date: 20131027